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Case study of microseismic techniques for stability analysis of pillars in a limestone mine

석회석 광산 내 광주의 안정성 분석을 위한 미소진동 계측기술의 현장적용

Kim, Chang Oh;Um, Woo-Yong;Chung, So-Keul;Cheon, Dae-Sung
김창오;엄우용;정소걸;천대성

  • Received : 2015.12.04
  • Accepted : 2016.02.23
  • Published : 2016.02.29

Abstract

This study deals with the case that was the field application of the microseismic monitoring techniques for the stability monitoring in a domestic mine. The usefulness and limitations of the microseismic techniques were examined through analyzing the microseismic monitored data. The target limestone mine adopted a hybrid room-and-pillar mining method to improve the extraction ratio. The accelerometers were installed in each vertical pillar within the test bed which has the horizontal cross-section $50m{\times}50m$. The measured signals were divided into 4 types; blasting induced signal, drilling induced signal, damage induced signal, and electric noise. The stability analysis was performed based on the measured damage induced signals. After the blasting in the mining section close to the test bed, the damage of the pillar was increased and rockfall near the test bed could be estimated from monitored microseismic data. It was possible to assess the pillar stability from the changes of daily monitored data and the proposed safety criteria from the accumulated monitored data. However, there was a difficulty to determine the 3D microseismic source positions due to the 2D local sensor arrays. Also, it was needed to use real-time monitoring methods in domestic mines. By complementing the problems encountered in the mine application and comparing microseismic monitored data with mining operations, the microseismic monitoring technique can be used as a better safety method.

Keywords

Microseismic monitoring;Hybrid room-and-pillar mining method;Pillar stability;Safety criteria

References

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Cited by

  1. A Study on Stability Analysis of Large Underground Limestone Openings considering Excavation Damaged Zone vol.26, pp.2, 2016, https://doi.org/10.7474/TUS.2016.26.2.131

Acknowledgement

Grant : 국내 석회석광 적용 자동차 경량화 광물 원료 등 미래 자원화 기술 실증화 연구

Supported by : 산업통상자원부